Alarm



UNITED STATES PATENT OFFICE.

4WILLIAM MCLAGHLAN, OF NEW YORK, N. Y., ASSIGNOB TO ROBERT LIVINGSTON, OF NEW YORK,

Specification of Letters Patent No.

To all whom t may concern:

Be it known that I, WILLIAM MoLAor-ILAN, of the city, county, and State of New York, have invented a new and useful mode of applying a portable alarm bell to the key of any lock in such a manner that when applied the key cannot be turned without causing the bell to ring and thereby giving an alarm and that the same shall be portable and susceptible of being applied and removed at pleasure, thereby making it auseful and safe preventative against burglary; and I do hereby declare that the following is a full and correct description thereof, reference being had to the accompanying drawings, making a part of this specification, and to the letters of reference marked thereon.

Figure 1 is a front view as set or applied to the key. Letter A is the key. B is the top plate which may be fastened to A in any way. O is a pin fastening plate B to A by means of a staple projecting underneath plate B. D is a wire fastened to the center with a round head (G) upon it which is passed through hole O the head resting on plate B halfway between the two holes 0 0 supporting the weight of the bell. Gr is the head of wire D. O, O, are two holes in plate B at any distance apart large enough for the head G to pass through. R is an open space connecting the holes 0 0 and large enough to allow the wire D to pass through. E is a chain with one end attached to plate B the other to stop F. F is a stop to control the action of the alarm which being drawn to position m (as now shown). prevents the alarm from ringing. H is the face of the bell. I is the bell. When the bell is arranged and remains in position of Fig. l no alarm or sound is given, and considered set- By bell in some places is meant the whole instrument.

Fig. 2 represents a side view. Lett-er A is the key as turned from its horizontal position (as set) to a partial vertical position. The letters in this correspond with Fig. l. B is the plate as in Fig. l, its position being changed by A has caused head G to slide from the center of B to and through hole o. O the pin as in Fig. l. D is the wire which has dropped from plate B. E is the chain supporting the weight of the bell. F is the stop drawn to position Y by the weight of the bell on the chain F which removes the stop F to position Y and allows the 16,01*?, dated November 4,1856.

alarm to act. H is the face. I the bell. The bell in the position Fig. 2 gives the required alarm.

Fig. 3 is a small section showing the construction of the stop F and H and its positions X and Y.

Fig. 4 is a representation of a side View of another mode of applying the alarm to produce the same effect. Letter A is the key. B the top plate. O a narrow plate under A. D is a screw connecting B and C, to fasten B and O to A. E is a small pin, when pushed in over F causes the bell to be held in a vertical position and when removed (or drawn back) allows the plates B and O to fall to the face H. Letter F I will call an aXle. Gr is a plate fastened to aXle F which forms a crank for stop K. K is a stop to prevent the revolution of the pin L. L is a pin in the axle of one of the wheels N controlled by stop K, and when against stop K, prevents the action of the alarm. M is a guide through which K passes. The bell as shown in Fig. 4 is applied to the key and while allowed to remain in this posit-ion will not ring.

Fig. 5 shows a front View of Fig. 4 intended to show more fully the plate Gr and stop K the letters and references corresponding with Fig. i and also shows the position of the bell when the alarm is not ringing.

Fig. 6, a front view of the same showing the position of the key A changed which turns the shaft F and the crank G thereby raising and removing the stop K from the pin L and allowing the alarm to act in which postion the alarm will ring.

I am aware that alarms have been applied to locks. I therefore do not claim the alarm or any particular construction of the alarm.

What I claim as new and my invention and for which I desire to secure by Letters Patent is Simply the application of a portable alarm (of any construction) to the key in the manner as set forth in the above specification and the accompanying drawings so that, the key being in the lock in one position cannot be interfered with or the position changed without indicating the same by causing an alarm to be given.

WILLIAM MOLAOHLAN.

Witnesses:

DE WITT C. CLARK. PETER Boron. 

